Document format :

{
    id: '{UUID}', // PRIMARY
    included: '{bool}';
    user_id: '{userID}', // SECONDARY INDEX
    game_id: '{gameID}', // SECONDARY INDEX
    tag_id: '{gameTagID in tags folder (API)}', // SECONDARY INDEX
    account_id: '{accountID - can be null}', // SECONDARY INDEX
    created: '{timestamp}', // SECONDARY INDEX
    updated: '{timestamp}', // SECONDARY INDEX
    size: '{textTotalSize}',
    game_account_info: {'Object with game account infos of account_id'},
    settings: {'Object with settings'},
    data_settings: {'Object with settings (related to the game) - can be null'},
    data: '{Game data - can be null}'
}

Example :

{
    id: 'f4e81a0e-f5e8-4eb3-bf95-c5203e1d87b9',
    included: true,
    user_id: '8a766142-be00-4661-abeb-a9e3e912dc05',
    game_id: 'lol',
    tag_id: 'LOL__RANKED_SOLO_SR__TIER',
    account_id: '27961a0e-f4e8-4eb3-bf95-c5203e1d87b9',
    created: 1519639337231,
    updated: 1519639337231,
    size: 10,
    game_account_info: {
        account_id: "8fqSAx6veh0g6paaP_mMtBCaE_Ae5ijAcBE_Q6tXwp7FSA",
        puuid: "uSNpdartPQ8HIT_KhJTutWJxXzXYLgn2KQTTzDknruVZM5rz8KXmy2WePsdsuj8DhFJ-p5mpQM4z9w",
        region: "euw",
        summoner_id: "Y-ZlcXwYKQmX8Wbrb6atVYffDmdWNx5ZKGg8AtsT5Oy_7cg"
    }
    settings: {
        format: 'lowercase',
        size: "default"
    },
    data_settings: {
        champion: 'irelia'
    },
    data: 'DIAMOND'
}